Prev: jump label v9: add docs
Next: Lieber Freund!!!
From: Yedire, Sandeep on 10 Jun 2010 08:50
Hi All,
What is the effect on filesystem blocks,data blocks if O_NONBLOCK
flag is used with a test application doing write to a file(64MB) on
NAND Flash.
Can any one please let me know
Regards,
Sandeep.Yedire

----------------------------------------------------------
T.Jefferson, 'Victory and defeat are each of the same price"
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
From: Robert Hancock on 10 Jun 2010 21:00
On 06/10/2010 06:44 AM, Yedire, Sandeep wrote:
> Hi All,
> What is the effect on filesystem blocks,data blocks if O_NONBLOCK
> flag is used with a test application doing write to a file(64MB) on
> NAND Flash.
> Can any one please let me know
> Regards,
> Sandeep.Yedire

O_NONBLOCK doesn't do anything on regular files, as far as I'm aware.
It's only useful on sockets, serial ports/TTYs, etc.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
From: Yedire, Sandeep on 11 Jun 2010 00:40
On 11 June 2010 06:20, Robert Hancock <hancockrwd(a)gmail.com> wrote:
> On 06/10/2010 06:44 AM, Yedire, Sandeep wrote:
>>
>> Hi All,
>> What is the effect �on filesystem blocks,data blocks if O_NONBLOCK
>> flag is used with a test application doing write to a file(64MB) on
>> NAND Flash.
>> Can any one please let me know
>> Regards,
>> Sandeep.Yedire
>
> O_NONBLOCK doesn't do anything on regular files, as far as I'm aware. It's
> only useful on sockets, serial ports/TTYs, etc.
>

[Sandeep] In Ext2 fs, I have noticed many frequent updates to data
blocks as compared to without this flag. I also noticed Dirty page
limit (44MB max) with O_NONBLOCK and 18 to 20MB max without this
flag. Because of this there is less Filesystem block updates with
O_NONBLOCK flag.

In case of Ext3, Dirty page limit is 18-20MB with or without this flag.
Its same with all modes of Ext3(data, ordered, writeback).

This is actually my concern.

Many Thanks,
Sandeep
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
 | 
Pages: 1
Prev: jump label v9: add docs
Next: Lieber Freund!!!